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Incomprehensible optical device!

That is, I found in the attic.
It is a small device (AA battery for comparison).
At the bottom of the mirror, the eyepiece - one lens ca. 2, 5-fold.
At the end of the "tube" - Matt stele.
What is covered in the "microscope"?





Source:
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...
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...
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...
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How to charge the batteries of smart phones and laptops, so they last longer?
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Personal hydrogen storage
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The future of e-books
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Charge the phone using a plastic bottle
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